This is but one more spectacular example of animal migration. Around the globe, in almost every habitat, in widely separated phyla, animals amaze with their navigational feats. To do what they do, each needs equipment to gauge its location and bearing, sensory systems to identify landmarks, propulsion systems to move efficiently, and instincts to switch on the appropriate behaviors. These interwoven systems all develop from complex instructions embedded in their genes.
via Geese Can Fly Over Mt. Everest without Oxygen Tanks – Evolution News & Views.